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Hackfut Security File Manager

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📄 pg_upgrade.1(22.02 KB)
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Editing: pg_xlogdump.1

'\" t
.\"     Title: pg_xlogdump
.\"    Author: The PostgreSQL Global Development Group
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: 2018
.\"    Manual: PostgreSQL 9.6.9 Documentation
.\"    Source: PostgreSQL 9.6.9
.\"  Language: English
.\"
.TH "PG_XLOGDUMP" "1" "2018" "PostgreSQL 9.6.9" "PostgreSQL 9.6.9 Documentation"
.\" -----------------------------------------------------------------
.\" * Define some portability stuff
.\" -----------------------------------------------------------------
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.\" http://bugs.debian.org/507673
.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.ie \n(.g .ds Aq \(aq
.el       .ds Aq '
.\" -----------------------------------------------------------------
.\" * set default formatting
.\" -----------------------------------------------------------------
.\" disable hyphenation
.nh
.\" disable justification (adjust text to left margin only)
.ad l
.\" -----------------------------------------------------------------
.\" * MAIN CONTENT STARTS HERE *
.\" -----------------------------------------------------------------
.SH "NAME"
pg_xlogdump \- display a human\-readable rendering of the write\-ahead log of a PostgreSQL database cluster
.SH "SYNOPSIS"
.HP \w'\fBpg_xlogdump\fR\ 'u
\fBpg_xlogdump\fR [\fBoption\fR...] [\fBstartseg\fR\ [\fBendseg\fR]]
.SH "DESCRIPTION"
.PP
\fBpg_xlogdump\fR
displays the write\-ahead log (WAL) and is mainly useful for debugging or educational purposes\&.
.PP
This utility can only be run by the user who installed the server, because it requires read\-only access to the data directory\&.
.SH "OPTIONS"
.PP
The following command\-line options control the location and format of the output:
.PP
\fIstartseg\fR
.RS 4
Start reading at the specified log segment file\&. This implicitly determines the path in which files will be searched for, and the timeline to use\&.
.RE
.PP
\fIendseg\fR
.RS 4
Stop after reading the specified log segment file\&.
.RE
.PP
\fB\-b\fR
.br
\fB\-\-bkp\-details\fR
.RS 4
Output detailed information about backup blocks\&.
.RE
.PP
\fB\-e \fR\fB\fIend\fR\fR
.br
\fB\-\-end=\fR\fB\fIend\fR\fR
.RS 4
Stop reading at the specified log position, instead of reading to the end of the log stream\&.
.RE
.PP
\fB\-f\fR
.br
\fB\-\-follow\fR
.RS 4
After reaching the end of valid WAL, keep polling once per second for new WAL to appear\&.
.RE
.PP
\fB\-n \fR\fB\fIlimit\fR\fR
.br
\fB\-\-limit=\fR\fB\fIlimit\fR\fR
.RS 4
Display the specified number of records, then stop\&.
.RE
.PP
\fB\-p \fR\fB\fIpath\fR\fR
.br
\fB\-\-path=\fR\fB\fIpath\fR\fR
.RS 4
Specifies a directory to search for log segment files or a directory with a
pg_xlog
subdirectory that contains such files\&. The default is to search in the current directory, the
pg_xlog
subdirectory of the current directory, and the
pg_xlog
subdirectory of
\fBPGDATA\fR\&.
.RE
.PP
\fB\-r \fR\fB\fIrmgr\fR\fR
.br
\fB\-\-rmgr=\fR\fB\fIrmgr\fR\fR
.RS 4
Only display records generated by the specified resource manager\&. If
list
is passed as name, print a list of valid resource manager names, and exit\&.
.RE
.PP
\fB\-s \fR\fB\fIstart\fR\fR
.br
\fB\-\-start=\fR\fB\fIstart\fR\fR
.RS 4
Log position at which to start reading\&. The default is to start reading the first valid log record found in the earliest file found\&.
.RE
.PP
\fB\-t \fR\fB\fItimeline\fR\fR
.br
\fB\-\-timeline=\fR\fB\fItimeline\fR\fR
.RS 4
Timeline from which to read log records\&. The default is to use the value in
\fIstartseg\fR, if that is specified; otherwise, the default is 1\&.
.RE
.PP
\fB\-V\fR
.br
\fB\-\-version\fR
.RS 4
Print the
pg_xlogdump
version and exit\&.
.RE
.PP
\fB\-x \fR\fB\fIxid\fR\fR
.br
\fB\-\-xid=\fR\fB\fIxid\fR\fR
.RS 4
Only display records marked with the given transaction ID\&.
.RE
.PP
\fB\-z\fR
.br
\fB\-\-stats[=record]\fR
.RS 4
Display summary statistics (number and size of records and full\-page images) instead of individual records\&. Optionally generate statistics per\-record instead of per\-rmgr\&.
.RE
.PP
\fB\-?\fR
.br
\fB\-\-help\fR
.RS 4
Show help about
pg_xlogdump
command line arguments, and exit\&.
.RE
.SH "NOTES"
.PP
Can give wrong results when the server is running\&.
.PP
Only the specified timeline is displayed (or the default, if none is specified)\&. Records in other timelines are ignored\&.
.PP
pg_xlogdump
cannot read WAL files with suffix
\&.partial\&. If those files need to be read,
\&.partial
suffix needs to be removed from the file name\&.
.SH "SEE ALSO"
Section 30.5, \(lqWAL Internals\(rq, in the documentation

Hackfut Security File Manager

Editing: pg_xlogdump.1

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